Phase 5 — Choices: Lightweight module wrapping the canvas-native
folk-choice-vote/rank/spider components. Lists choice shapes from the
space's Automerge doc, links to canvas for creation/interaction.
Phase 6 — Funds: Port of rfunds-online BudgetRiver visualization to
vanilla web component. Includes simulation engine (pure functions),
types (stripped @xyflow), demo presets, and SVG sankey river with
animated waterfalls, overflow branches, and sufficiency badges.
Flow-service API proxy for same-origin frontend calls.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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